Well, Crysis Directx10 is a different case. I can play at around 13FPS at Very High in Directx 10, and many would say that's not a playable framerate. Still, its good enough for me, I can do with some stutters if I get Image quality.
Btw, I can do very high in Directx9 too now, with a trick. So don't exactly need Directx10 now. Almost same Image quality, but 21 FPS in XP.